#topDiv {
	height: 70px;
	background-color: #28384A;
	color: white;
	line-height: 70px;
	font-size: 26px;
	font-weight: bolder;
	padding-left: 10px;
}
#middleDiv {
	/* 让其在中部保持不变 */
	position: absolute;
	top: 70px;
	right: 0px;
	left: 0px;
	bottom: 30px;
}
#leftDiv {
	position: absolute;
	background-color: #42719A;
	top: 0px;
	bottom: 0px;
	left: 0px;
	width: 250px;
	color: white;
	padding-top: 10px;
	padding-left: 15px;
}
/* 选择id值leftDiv的所有的li孩子元素 */
#leftDiv li {
	height: 30px;
	line-height: 30px;
}
#rightDiv {
	/* background-color: red; */
	position: absolute;
	top: 0px;
	bottom: 0px;
	right: 0px;
	left: 250px;
}
#rightDiv iframe {
	width: 100%;
	height: 100%;
}
#bottomDiv {
	height: 30px;
	background-color: #28384A;
	color: white;
	line-height: 30px;
	font-size: 16px;
	text-align: center;
	/* 让其在底端保持不变 */
	position: absolute;
	left: 0px;
	right: 0px;
	bottom: 0px;
}
